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Re: Power to both buss bars
The "right way" to fix that is to replace it and do a service upgrade, anything less is "not the right way".
That said ... *IF* the service entrance conductors fed a single 60 amp *SINGLE POLE* breaker in a 4 circuit panelboard (back feed the breaker, securing it in place properly), then have two 60 amp single pole breakers (each breaker on the same bus, typically this can be accomplished by separating the breakers with one blank space between them - making sure they are on the same bus which is fed by the single pole 60 amp main breaker) with conductors from those breakers feeding each main terminal in a panelboard with no main (just main terminals).
That way, you still only have 120 volts, you still have both bus bars energized, and you still have only 60 amp main protection (from the first single pole breaker). The first single 60 amp single pole breaker becomes the service disconnect, that enclosure becomes the service equipment (neutral bonded to ground), and the downstream panel becomes a non-service equipment panel (neutral isolated from ground, fed by an insulated neutral conductor, two insulated hot conductors, and one equipment grounding conductor).
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